Visualize mapped tasks as a group in flow run graph

[EmilRex]

Describe the current behavior

When mapping across a large number of tasks, each task is independently visualized in the flow run graph. The density of task nodes in the visualization make it difficult to understand the progress and state of the flow run as a whole.

Describe the proposed behavior

Tasks that are mapped have an implicit grouping. Displaying mapped tasks as a single node in the graph that can be optionally expanded (similar to a subflow) would make the graph interpretable. Ideally the node would display some visual indicator of progress, for example the count of each task grouped by state.

Example Use

No response

Additional context

No response